package com.zzf.educenter.controller;

import com.google.gson.Gson;
import com.zzf.commonutils.JwtUtils;
import com.zzf.educenter.entity.UcenterMember;
import com.zzf.educenter.service.UcenterMemberService;
import com.zzf.educenter.utils.ConstantWxUtils;
import com.zzf.educenter.utils.HttpClientUtils;
import com.zzf.servicebase.exceptionhandler.GuliException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //生成微信扫描的二维码
    @GetMapping("login")
    public String getWxCode() {
// 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
//对redirect_url进行URLEncode编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8"); //url编码
        } catch (UnsupportedEncodingException e) {
            throw new GuliException(20001, e.getMessage());
        }
        String url = String.format(baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
//请求微信地址
        return "redirect:" + url;
    }

    //获取扫描人信息,添加数据
    @GetMapping("callback")
    public String callback(String code, String state) {
        System.out.println("code" + code);
        System.out.println("state" + state);
        //从redis中将state获取出来，和当前传入的state作比较
        //如果一致则放行，如果不一致则抛出异常：非法访问
        //向认证服务器发送请求换取access_token
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";
        String accessTokenUrl = String.format(baseAccessTokenUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_APP_SECRET,
                code);
        try {
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            System.out.println("accessToken=============" + accessTokenInfo);

            //解析json字符串
            Gson gson = new Gson();
            HashMap map = gson.fromJson(accessTokenInfo, HashMap.class);

            String accessToken = (String) map.get("access_token");
            String openid = (String) map.get("openid");

            //查询数据库当前用用户是否曾经使用过微信登录
            UcenterMember member = memberService.getByOpenid(openid);
            if (member == null) {
                System.out.println("新用户注册");
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, accessToken, openid);
                String resultUserInfo = null;
                try {
                    resultUserInfo = HttpClientUtils.get(userInfoUrl);
                    System.out.println("resultUserInfo==========" + resultUserInfo);
                } catch (Exception e) {
                    throw new GuliException(20001, "获取用户信息失败");
                }
                //解析json
                HashMap<String, Object> mapUserInfo = gson.fromJson(resultUserInfo, HashMap.class);
                String nickname = (String) mapUserInfo.get("nickname");
                String headimgurl = (String) mapUserInfo.get("headimgurl");
                //向数据库中插入一条记录
                member = new UcenterMember();
                member.setNickname(nickname);
                member.setOpenid(openid);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            // 生成jwt
            String token = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //因为端口号不同存在蛞蝓问题，cookie不能跨域，所以这里使用url重写
            return "redirect:http://localhost:3000?token=" + token;
        } catch (Exception e) {
            throw new GuliException(20001, "获取access_token失败");
        }
    }
}
